CN110257753A - A method of optimizing iron-based amorphous coating performance in supersonic flame spraying technology - Google Patents
A method of optimizing iron-based amorphous coating performance in supersonic flame spraying technology Download PDFInfo
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- CN110257753A CN110257753A CN201910638191.7A CN201910638191A CN110257753A CN 110257753 A CN110257753 A CN 110257753A CN 201910638191 A CN201910638191 A CN 201910638191A CN 110257753 A CN110257753 A CN 110257753A
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- based amorphous
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- supersonic flame
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/129—Flame spraying
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- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Coating By Spraying Or Casting (AREA)
Abstract
The invention discloses a kind of in supersonic flame spraying technology optimizes the method for iron-based amorphous coating performance, belongs to supersonic flame spraying technical field.This method is during preparing iron-based amorphous coating using supersonic flame spraying, temperature before making powder particle hit substrate is between Fe-based amorphous solidus and liquidus temperature, amorphous powder particle is set to be in semi-molten state, particle has good mobility on substrate, and the porosity of prepares coating is minimum, compactness highest.Guarantee particle temperature in TSAnd TLBetween on the basis of, powder particle hit substrate before speed it is bigger, prepared amorphous coating porosity is lower.Thus optimal barrel length 210mm-240mm, gun barrel bore 12mm-14mm are selected.This method is prepared for the iron-based amorphous coating of low porosity, to improve the corrosion resistance of iron-based amorphous coating, pushes it as the application of surface protection coating material.
Description
Technical field
The present invention relates to supersonic flame spraying technical fields, and in particular to a kind of excellent in supersonic flame spraying technology
Change the method for iron-based amorphous coating performance.
Background technique
The defects of amorphous alloy is since there is no the crystal boundary of crystalline material, defect, segregation and precipitate, therefore in many
Aspect is showed compared with the superior performance of Conventional alloys material, such as high rigidity, high elastic modulus, high-wearing feature and excellent resistance to
Corrosive nature.In recent decades, people also focus more on amorphous alloy work other than concern prepares large-size bulk amorphous alloy
For the application of surface protection coating.In numerous amorphous alloy systems, Fe-based amorphous alloy is the system of most application prospect
One of, iron base amorphous alloy coatings are while keeping excellent wear-corrosion resistance, and cost performance with higher, more suitable
Be widely applied together in as surface protection coating material, at present petrochemical industry, water power thermoelectricity, naval vessel anti-corrosion with
And the fields such as nuclear industry are applied or show wide application prospect.
Currently, the preparation of iron-based amorphous coating mainly uses heat spraying method.In numerous heat spraying methods, supersonic flame
Spraying has high flame flow velocity degree and low flame temperature, and the coating more conducively prepared obtains amorphous structure, is acknowledged as preparing
The best approach of iron-based amorphous coating.Porosity defects in supersonic flame spraying iron base amorphous coating are unavoidably to exist
's.It is well known that the corrosion resisting property of coating and porosity defects are closely related, coating layering caused by corroding caused by porosity defects and
Peeling is one of most common failure mode of coating.It is Fe-based amorphous in chloride ion-containing medium in the usage environment of some harshnesses
Coating is also subjected to corrosion caused by porosity defects, substantially reduces the corrosion protection effect and service life of iron-based amorphous coating,
To limit iron-based amorphous coating in the extensive use in each field.Therefore, during supersonic flame spraying, pass through optimization
Spraying parameter reduces the quantity of porosity defects in coating, this is played for improving the corrosion resistance of iron-based amorphous coating
Key effect.
Summary of the invention
The purpose of the present invention is to provide a kind of to optimize iron-based amorphous coating performance in supersonic flame spraying technology
Method is suitable for the optimal gun barrel size for spraying iron-based amorphous coating by selection, reduces the quantity of porosity defects in coating, is improved
The compactness of coating, and then the corrosion resistance of iron-based amorphous coating is improved, push its answering as surface protection coating material
With.
To achieve the above object, the technical solution adopted in the present invention is as follows:
A method of optimizing iron-based amorphous coating performance in supersonic flame spraying technology, this method is super in utilization
During velocity of sound flame spray technique prepares iron-based amorphous coating, make amorphous powder particle before hitting substrate in semi-molten
State makes particle have good mobility on substrate, to reduce the porosity defects in prepared iron-based amorphous coating, mentions
High coating compactness.
Temperature T before hitting substrate by control powder particle, makes T in Fe-based amorphous solidus temperature TSAnd liquidus curve
Temperature TLBetween when, amorphous powder particle is in semi-molten state.
During the present invention prepares iron-based amorphous coating using supersonic flame spraying technology, T is in control TSAnd TL
Between on the basis of, powder particle hit substrate before speed it is bigger, the porosity defects of prepared iron-based amorphous coating are fewer,
Porosity is lower.
Since the size of barrel length used in supersonic flame spraying technology and bore directly affects the pressure of flame stream
Field, velocity field and temperature field finally deposit rank in coating to influence the speed and temperature change in powder particle flight course
Section forms porosity defects.Therefore, the present invention using barrel length during computational fluid dynamics simulation supersonic flame spraying and
The influence of bore.Finally gun barrel parameter used is optimized, that is, barrel length 210mm-240mm, gun barrel bore are
12mm-14mm。
It Design Mechanism of the invention and has the beneficial effect that:
Temperature before powder particle hits substrate is in Fe-based amorphous solidus and liquidus temperature (TSAnd TL) between
When, amorphous powder particle is in semi-molten state, and particle has good mobility, supersonic flame spraying preparation on substrate
The porosity of coating is minimum, compactness highest.In addition, meeting T in particle temperatureSAnd TLBetween on the basis of, powder particle hit base
Speed before plate is bigger, and prepared amorphous coating hole shortcoming is fewer, and porosity is lower.
The main path for reducing supersonic flame spraying iron base amorphous coating porosity defects is Optimizing Process Parameters, the present invention
Using the influence of barrel length and bore during computational fluid dynamics simulation supersonic flame spraying, by the pressure for analyzing flame stream
The field of force, velocity field and temperature field are on the speed and temperature influence in powder particle flight course.Wherein, gun barrel size influences powder
Speed and temperature of the particle in flight course, to influence the formation of hole in deposition process.Therefore, by optimizing gun barrel ruler
Very little parameter, and then the porosity defects in coating are reduced, have great importance to pushing it to be engineered application.
The present invention has studied the gun barrel size affecting laws in the supersonic flame spraying of iron-based amorphous coating: gun barrel size
Chamber pressure initial value is not influenced, gun barrel bore is bigger, and the pressure amplitude of lance outlet is bigger, this will affect flame
The speed and temperature of stream；Gun barrel bore is identical, and when barrel length difference, flame stream temperature (speed) amplitude of variation has with barrel length
It closes, barrel length is longer, and flame stream temperature (speed) is higher, and barrel length is identical, when gun barrel bore difference, the flame in gun barrel exit
Stream temperature (speed) amplitude of variation is related with gun barrel caliber size, and gun barrel bore is bigger, and flame stream temperature (speed) fluctuation is bigger；Rifle
The number of pipe exit Mach cone is unrelated with gun barrel size.Its powder particle flight characteristics: particle temperature (speed in flight course
Degree) amplitude of variation is related with barrel length, and barrel length is longer, and particle temperature (speed) in flight course is higher；Gun barrel mouth
Diameter is bigger, and particle temperature (speed) is high.
Therefore the present invention is in supersonic flame spraying to the optimal selection of gun barrel are as follows: barrel length: 210mm-240mm,
Gun barrel bore: 12mm-14mm.
The it is proposed of the method for the present invention solves the problems, such as that vast resources wastes in previous spraying parameter optimization process, and obtains
The optimal gun barrel size for obtaining the iron-based amorphous coating for preparing low porosity, to improve the corrosion resistance of iron-based amorphous coating
Can, push it as the application of surface protection coating material.
Detailed description of the invention
Fig. 1 is coating XRD diagram prepared by embodiment 1；
Fig. 2 be temperature variation in powder particle flight course；
Fig. 3 is velocity profile in powder particle flight course；
Fig. 4 is coating surface and section SEM photograph prepared by embodiment 1；Wherein: the surface (a)；(b) section.
Specific embodiment
The present invention is described in detail below in conjunction with drawings and examples.
Embodiment 1:
Iron-based amorphous coating is prepared using supersonic flame spraying technology, in which:
Choose barrel length: 210mm-240mm, gun barrel bore: 12mm-14mm.Amorphous powder is obtained by numerical simulation
Temperature and velocity variations are regular (shown in Fig. 2 and 3) during particle flight, and as shown in Figure 2, diameter is that 30 μm of powder particle is hit
When temperature before hitting substrate is between Fe-based amorphous solidus and liquidus temperature, amorphous powder particle is in semi-molten shape
State, particle have good mobility on substrate, and the porosity of supersonic flame spraying prepares coating is minimum.It prepares accordingly
Iron-based amorphous coating is as shown in Figure 1, Fig. 1 shows the amorphous characteristic of prepared coating.Fig. 4 is the surface of prepared amorphous coating
Scheme with section SEM, the in good condition of the surface melting of coating can be seen that by Fig. 4 (a), it is excessively existing without no cofusing particle and fusing
As being calculated according to Fig. 4 (b) and obtaining the porosity of coating is 0.72%.
Comparative example 1:
Difference from example 1 is that:
Gun barrel bore are as follows: 10mm-12mm.
As a result: powder particle hits the temperature before substrate and speed is both less than embodiment 1, coating porosity 1.09%,
Higher than embodiment 1.
Comparative example 2:
Difference from example 1 is that:
Barrel length are as follows: 250mm-290mm, gun barrel bore are as follows: 10mm-12mm.
As a result: powder particle hits the temperature before substrate and speed is both greater than embodiment 1, coating porosity 1.66%,
Higher than embodiment 1.
Comparative example 3
Difference from example 1 is that:
Barrel length are as follows: 250mm-290mm.
As a result: powder particle hits the temperature before substrate and speed is both greater than embodiment 1, coating porosity 1.73%,
Higher than embodiment 1.
Comparative example 4:
Difference from example 1 is that:
Barrel length are as follows: 180mm-210mm.
As a result: powder particle hits the temperature before substrate and speed is both less than embodiment 1, coating porosity 2.31%,
Higher than embodiment 1.
Comparative example 5:
Difference from example 1 is that:
Barrel length are as follows: 180mm-210mm, gun barrel bore are as follows: 10mm-12mm.
As a result: powder particle hits the temperature before substrate and speed is both less than embodiment 1, coating porosity 2.94%,
Higher than embodiment 1.
Claims (4)
1. a kind of method for optimizing iron-based amorphous coating performance in supersonic flame spraying technology, it is characterised in that: this method
It is to make amorphous powder particle before hitting substrate during preparing iron-based amorphous coating using supersonic flame spraying technology
In semi-molten state, make particle that there is good mobility on substrate, to reduce in prepared iron-based amorphous coating
Porosity defects improve coating compactness.
2. the method according to claim 1 for optimizing iron-based amorphous coating performance in supersonic flame spraying technology,
Be characterized in that: control powder particle hits the temperature T before substrate, makes T in Fe-based amorphous solidus temperature TSWith liquidus curve temperature
Spend TLBetween when, amorphous powder particle is in semi-molten state.
3. the method according to claim 1 or 2 for optimizing iron-based amorphous coating performance in supersonic flame spraying technology,
It is characterized by: during preparing iron-based amorphous coating using supersonic flame spraying technology, before powder particle hits substrate
Speed it is bigger, the porosity defects of prepared iron-based amorphous coating are fewer, and porosity is lower.
4. the method according to claim 3 for optimizing iron-based amorphous coating performance in supersonic flame spraying technology,
It is characterized in that: gun barrel parameter used in supersonic flame spraying technology is optimized, that is, barrel length 210mm-240mm,
Gun barrel bore is 12mm-14mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115612965A (en) * | 2022-10-20 | 2023-01-17 | 辽宁石油化工大学 | Preparation method of completely amorphous coating |
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Cited By (2)
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